Incandescent lamp



Jan. 8, 1957 F. T. MAY

INCANDESCENT LAMP Filed Aug. 2'7, 1953 INVENTOR. F3 7'. MH Y.

I zv x United States Patent INCANDESCENT LAMP Frederick Theodore May, Verona, N. IL, assignor to Westinghouse Electric Corporation, East Pittsburgh, Pa., a corporation of Pennsylvania Application August 27, 1953, Serial No. 376,817

2 Claims. (Cl. 313--43) The present invention relates to incandescent lamps and, more particularly, to a heat baffle and apparatus for making said heat baflie.

The conventional higher wattage incandescent lamps, for example above 300 watts, employ a heat reflector shield assembly for protecting the soft glass stem. This heat shield assembly usually has a mica heat reflector disc of circular cross section and comprising a series of thin laminations or sheets provided with leading-in conductor clearance holes therein and a diametrical mounting slit extending through said holes to one side of the disc periphery. A V-shaped metallic spring clip retainer fits about the vertical glass arbor of the lamp stem and holds the mica disc in place on top of the stem press. The mica disc is not only in short supply during a period of material shortages but is also expensive and fragile in nature, tending to break or peel during the handling involved in the mounting operation.

Hence, it has been found advantagous according to my invention to eliminate the mica disc heat reflector assembly and to employ a metallic heat baffie having a pair of semi-circular half-baffies or shields which may be pressed against the press of the lamp stem and then secured together either by riveting, spot welding, or mechanical notching by apparatus of my invention. My automatic heat baffle assembling apparatus comprises a pair of identical and opposed devices on either side of a lamp stem. Each device has a half-baffle hopper for aligning a stack of half-baffles therein, automatic vacuum transfer means for feeding a half-baffle into overlapping end position about the press of a stem and an assembling device, such as a pair of spot welders for securing the half-baffles together in position about the press of the stem.

In its general aspect the present invention has as its objective an incandescent lamp having an improved stem press heat baffie.

A specific object of the present invention is an improved heat bafiie for an incandescent lamp comprising a pair of end overlapping half-bafiies pressable about the press of the lamp stem and securable thereat either by riveting, spot Welding or mechanical notching.

An additional object is an improved heat baflie for an incandescent lamp which eliminates the expensive and fragile mica disc of the Prior art.

A still further object is an automatic heat baffle assembling apparatus comprising a pair of cooperating and opposed half-baffle feeding and positioning devices located on either side of a lamp stem, each comprising a half-baffie hopper, and automatic transfer and positioning means and an assembling device for joining the halfbafiles together.

Referring to the drawing in which like numerals of references indicate similar parts throughout the several views:

Fig. l is a side elevational view of a high Wattage incandescent lamp embodying the improved baffle of my invention.

Fig. 2 is a plan sectional view of the lamp of Fig. l

on the line IIII of Fig. 1 in the direction of the arrows.

Fig. 3 is a plan view of the half-bathe of my invention.

Fig. 4 is a fragmentary perspective view of a lamp stem, showing the heat baffle of my invention positioned about the press thereof.

Fig. 5 is a side elevational view partially in section of the automatic heat baffle assembling apparatus of my invention showing the cooperating half-baffle feeding and positioning devices.

Fig. 6 is a plan view of the automatic heat bafiie assembling apparatus, showing the half-bathe hoppers of the feeding and positioning devices and the assembling devices, such as a pair of spot welders.

Fig. 7 is a side elevational view of the automatic heat baffle assembling apparatus, showing in particular the operation of the assembling device.

Referring now to the drawings (Fig. l) in detail an incandescent lamp of the higher Wattage type, for example 300 watts or higher, is designated by the reference numeral 10. This lamp may comprise a vitreous envelope 12 to which is sealed a filamentary mount 14. A base 16 is secured, by a suitable cement, about the seal portion of the lamp 10. This mount 14 may comprise a vitreous stem 18 having a press 20, a pair of leading-in and supporting conductors 22 sealed therethrough, an arbor 24 extending axially upward from the press 20, a suitable filament 26 supported by the conductors 22 and a plurality of filament supports 28 extending from a button 30 provided in the inner end of the arbor 24.

A metallic heat bathe 32 (Figs. 1, 2, 3 and 4) of my invention suitably aluminum is mounted about the press 20. This bafiie 32 comprises a pair of semi-circular half-baffles 34 (Fig. 3) suitably provided with a universal mounting slot 36 in the diametrical straight inner edge.

It will be understood that while the contours of the press 20 of the stem 18 are generally elliptical in nature, there is considerable variance in the overall cross-section of said press. By providing the slot 36 with generally tapered outwardly diverging sides my half-baffle 34 will readily fit the contour of any and all presses encountered in the manufacture of such higher wattage incandescent lamps as, for example, the lamp 10.

Apparatus for assembling and mounting the baffle Referring now to Figs. 5, 6 and 7 apparatus of my invention for simultaneously assembling and mounting a heat bafile 32 on a press 20 is designated by the reference numeral 40. The apparatus 40 comprises generally a pair of opposed and cooperating feeding and positioning devices 42 and heat baffle assembling means 44 such as, for example, the spot welders shown in Figs. 6 and 7.

As shown particularly in Fig. 5 a stem 18 of the filament mount 14 may be positioned by means of its flare on a holder 50 with the long axis of the press 20 extending perpendicular to the plane of the drawing. Each of the half-battle feeding and positioning devices 42 are positioned adjacent the press 20 of the stem 18 as hereinafter explained.

Each of the feeding and positioning devices 42 is provided with a half-bathe hopper 52 secured to a plurality of supporting and guide arms 53, in the present showing 2 for each hopper 52. Each of the arms 53 extend laterally inwardly from a mount rod 54 which is upstanding from a suitable bench or mounting table (not shown). In addition, each of the feeding and positioning devices 42 is provided with vacuum transfer and positioning means 56.

Each of the half-bafile hoppers 52 is generally semicircular in cross section and contoured to receive and align a plurality of half-baffles 34 in stacked arrangement one on top of another. Each hopper 52 is generally open ended at both ends and except for overlapping lip portions 58 is open sided along the side adjacent the slot 36 of the half-baffles 34.

It will be understood that the inner portions of each supporting and. guide arm 53, adjacent the stem 18 is provided with a guide lip 62 for insuring the proper positioning of a heat bathe 34 against the press 2411 of the stem 1.8 by the vacuum transfer means 56 as hereinafter explained. it will be further understood that the supporting and guide arms 53 of the left hand (when viewed in Fig. feeding and positioning device 42 is positioned slightly above the corresponding arms 53 of the right hand feeding and positioning device 42. Thus, with the simultaneous delivery of a half-battle 34 from each of the devices 42, the diametrical straight end portions of each half-bathe overlap and rest one upon the other, as inclicated by the dotted lines shown in Fig. 5.

Each vacuum transfer device 56 is provided with a hollow pick-up rod 64 carrying a pickup cup as suitably contoured to grip the bottom surface of the bottom halfbaffie 34, in the hopper 52, as shown in Fig. 5. The rod 64 is connected to a suitable intermittent vacuum system (not shown) and is activated by suitable means such as cam action (not shown) to reciprocate in a horizontal plane for delivery and positioning of a half-bafie 34, as shown by thcdotted lines in Fig. 5.

The automatic assembling device 4-4, in the specific showing of Figs. 6 and 7 may comprise for example a pair of? resistance, butt, percussive type spot welders. These welders have, as particularly shown in Fig. 7, an upper electrode rocker arm 67 and a lower rocker arm 68 for carrying respectively upper and lower movable welding electrode 72 and These electrodes 72 and 7 4, are formed to avoid contact with the above mentioned positioned and moving parts and yet to secure the overlapping end portions of the half-bafiles 34 when the half-bafiies 34 are positioned by the transfer means 56 about the press 2'0 of the stem 18.

Operation The half-baffle hoppers 52 of the automatic heat baffle assembling apparatus 41? of my invention are suitably filled with half-battles 34 by hand. At a predetermined time in the operating cycle the vacuum system (not shown) attached to the transfer rod 64 of the transfer device 56 is activated. This causes the transfer cup 66 to securely engage the bottom surface of the bottom halfbatile 34 in each of the half-baffle hoppers 52. With the vacuum system still in operation, the transfer devices 56 move horizontally inwardly toward the press 29 of the stem 18 until the universal slots 36 of each heat battle 34 are in fixed engagement with the press 21? and the end portions of the half baflies 34 are overlapping, as shown by the dotted lines in Fig. 5. With the halfbafiles 34 so positioned and still secured by the transfer cups 436 of the transfer devices 56, the upper and bottom welding electrodes 72 and 74 respectively engage the overlapping end portions of the half-bafiles 34 and simultaneously spot weld the half-baiiles together to form heat baffie 32 and to secure said baffle 32 to the press 21). With the recovery of the welding arms 67 and 68 of the assembling device 44, the vacuum system of the transfer devices 56 is shut 0E, thus releasing the now assembled heat bafile 32. The transfer devices 56 are then reciprocated outwardly from the stem 18 to their normal rest or loading positions.

It will be further understood that while I have indicated one specific embodiment (as required by the patent statue) that the heat bathe-32 of my invention may be joined, as by welding, it will be understood that this as scmbling may be accomplished either by riveting or mechanical notching.

Although a preferred embodiment has been described it will be understood that modifications may be made within the spirit and scope of the invention.

I claim:

1. A high wattage incandescent electric lamp, having an envelope and a filamentary mounted sealed to said envelope, said mount having at least a stern provided with a press and a metallic heat bailie secured about said press, said bafile comprising a pair of semi-circular half-battles provided with a universal mounting slot along their diametrical straight inner edge for engagement with said press and secured together in overlapping endwise engagement, said slot having tapered outwardly diverging sides for readily fitting the variable contour of said press.

2. A heat bafile for a high wattage incandescent electric lamp comprising a pair of semi-circular half-bafi'les each provided with a universal mounting slot along its diametrical straight inner edge for fixed engagement with a lamp press, said half-baifies being secured together in overlapping end engagement, said slot having tapered outwardly diverging sides for readily fitting the variable contour of said press.

References Cited in the file of this patent UNITED STATES PATENTS 1,807,971 Day June 2, 1931 1,974,086 Smith Sept. 18, 1934 2,148,503 Reyburn Feb. 28, 1939 2,181,290 Wilkins Nov. 28, 1939 2,277,858 Skellet Mar. 31, 1942 2,395,977 Sidney Mar. 5, 1946 2,504,753 Suydarn Apr. 18, 1950 2,624,019 Leighton Dec. 30, 1952 

